While I know very little about Balinese kerises, the ones in the photos seem very much like the classic "tourist keris"... albeit of somehow better workmanship.
You make the asumption that the majority of Balinese keris hilts are in the form of Rakasas/demons. However, from all what I have seen, both on internet and in Indonesian museums, the most prevalent figural form for Balinese keris hilts is by far that of god Bayu or at least somebody resembling him (see link below). I have also seen quite many supposedly representing Arjuna. So, I seriously doubt that your asumption is correct.
http://www.vikingsword.com/vb/showth...balinese+keris